Struts2和Servlet如何一起使用

Struts2和Servlet

1、在struts2的action中可以通过实现ServletResponseAware/ServletResquestAware接口(org.apache.struts2.inteceptor.ServletResponseAware/ServletResquestAware)直接访问HttpServletResponse/HttpServletRequest，像servlet中使用这两个对象一样。

2、使用struts2提供的ActionContext类直接获取Servlet API。

在同一个项目中，如果既用到servlet又用了struts框架，运行项目时可能无法正常使用servlet，解决办法如下：

该类是定义了一个过滤器，当既用到struts2有用到servlet时，

必须用该过滤器对所有的servlet做一次过滤，否则servlet将无法正常运行。同时在web.xml 中，在定义struts的核心控制器前面添加该过滤器，添加代码如下：

redisp

filters.ReDispatcherFilter（该过滤器的类名）

includeServlets

所有配置的servlet名字

redisp

/*

import java.io.IOException;

import java.util.ArrayList;

import java.util.Arrays;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

public class ReDispatcherFilter implements Filter {

public void destroy() {

// TODO Auto-generated method stub

}

public void doFilter(ServletRequest req, ServletResponse resp,

FilterChain chain) throws IOException, ServletException

{

HttpServletRequest request = (HttpServletRequest)req;

String target = request.getRequestURI();

target=

https://www.360docs.net/doc/45108843.html,stIndexOf("?")>0?target.substring(https://www.360docs.net/doc/45108843.html,stIndexOf("/")+1,https://www.360docs.net/doc/45108843.html,stIndexOf("?")-target .lastIndexOf("/")):target.substring(https://www.360docs.net/doc/45108843.html,stIndexOf("/")+1);

System.out.println(target);

if(this.includes.contains(target))

{

RequestDispatcher rdsp = request.getRequestDispatcher(target);

System.out.println("go..............."+rdsp);

rdsp.forward(req, resp);

}

else

chain.doFilter(req, resp);

}

private ArrayList includes = new ArrayList();

public void init(FilterConfig config) throws ServletException {

this.includes.addAll( Arrays.asList(config.getInitParameter("includeServlets").split(","))); }

}